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chore(build): make xce-build.sh self-wrap into nix develop

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meson/ninja/capnp/Go only exist inside the hermetic nix dev shell, but
xce-build.sh never entered it itself -- the /xce-build skill documented
wrapping every invocation in `nix develop ./src --command ...` by hand,
so a bare `bash src/tools/xce-build.sh ...` (run directly instead of
through the skill) failed opaquely with "meson: command not found". This
was a recurring, previously-logged gap that resurfaced again today mid
bug-1789 verification.

The script now checks IN_NIX_SHELL at the top and re-execs itself under
`nix develop` if unset, so every caller -- the skill, a bare invocation,
CI, a human at a terminal -- gets it automatically. A nested call (already
inside the shell) is a no-op past that check. README.md's daily-develop
section updated to match; the old "or use nix develop --command" example
is now redundant and removed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GLfB5uWRdmx2WiZSFC7Fm7
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Rongsong Shen 2026-09-07 15:31:06 +00:00
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14
README.md
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@ -114,12 +114,12 @@ git add frontend/apiserver/go.mod frontend/apiserver/go.sum frontend/apiserver/v
## 3.4 build (for daily develop)
日常开发推荐直接使用 `src/tools/xce-build.sh`（若在 Claude Code 中开发，对应的是 `/xce-build` skill），
它会执行 `meson setup` / `meson compile`，并在 `asan` profile 下跑测试。**注意它自己不会进入 `nix develop`
环境**，需要先手动 `nix develop`，或者用 `nix develop --command` 包一层：
它会执行 `meson setup` / `meson compile`，并在 `asan` profile 下跑测试。**该脚本会自动进入 `nix develop`
环境**（脚本开头检测 `IN_NIX_SHELL`，未设置时自动用 `nix develop` 重新执行自身），无需手动
`nix develop` 或额外包一层，直接跑即可：
```sh
cd xce/src
nix develop
tools/xce-build.sh # 全部组件 + 全部测试 (asan profile, 输出到 xce.build/)
tools/xce-build.sh controller # 只构建/测试 controller (lib + controller + xce_test)
@ -128,12 +128,8 @@ tools/xce-build.sh scheduler # 只构建/测试 scheduler
tools/xce-build.sh apiserver # 只构建/测试 apiserver + xcecli (Go)
```
或者不进入交互式 shell，直接一条命令跑：
```sh
cd xce/src
nix develop --command tools/xce-build.sh controller
```
（如果已经身处 `nix develop` 交互式 shell 内运行以上命令，脚本会检测到 `IN_NIX_SHELL` 已设置，跳过重新
进入的步骤，直接执行构建。）
支持三种 profile（`tools/xce-build.sh [component] [profile]`）：